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National Pi Day - 2021-03-14
What is National Pi Day?
What do pie lovers and math geeks have in common? It's National Pi Day, which is also known as "3.14" because it's the first three digits of pi. Those who love math and desserts will celebrate the holiday on March 14th! Pi is a ratio between the circumference of a circle and its diameter. The idea of pi has been known for over 4,000 years, but it wasn't until the 20th century that mathematicians were able to accurately calculate it. It was used by the Egyptians and Babylonians to build the pyramids and other great structures. Pi is the ratio of the circumference to its diameter. Mathematicians have calculated it by various methods. It’s represented by the Greek letter π.  
When is National Pi Day?
Pi Day is celebrated on March 14th around the world.
History of National Pi Day
In 1988, Larry Shaw put together a celebration of Pi Day at the San Francisco Exploratorium. All these years later, the Exploratorium continues to celebrate it.
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